Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

作者：Marcela Bonilla Claudia; Herrero Albillos Julia; Bartolome Fernando; Miguel Garcia Luis; Parra Borderias Maria; Franco Victorino

来源：Physical Review B, 2010, 81(22): 224424.

DOI：10.1103/PhysRevB.81.224424

A universal curve for the change in the magnetic entropy has been recently proposed for materials with second-order phase transitions. In this work we have studied the universal behavior of the magnetocaloric effect in the family of cobalt Laves phases, RCo(2), and mixed manganites, La(2/3)(Ca(x)Sr((1-x)))(1/3)MnO(3), which exhibit first- and second-order phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve for materials with second-order phase transition as opposed to the first- order phase transition compounds, for which this collapse does not hold. This result suggests that the universal curve may be used as a further criterion to distinguish the order of the phase transition.

• 出版日期2010-6-16